LinguaSol Junior Software Developer Interview Questions and Answers for Freshers

Simple apptitude , java , dotnet ,c++ 100 MCQ questions for 60 min .

Q1. Explain Quick sort , Merge Sort algorithm
Ans. 
Quick sort and Merge sort are popular sorting algorithms used to efficiently sort arrays of elements.
• Quick sort: Divide and conquer algorithm, picks a pivot element and partitions the array around the pivot. Recursively sorts subarrays.

• Merge sort: Divide and conquer algorithm, divides the array into two halves, recursively sorts the halves, and then merges them back together.

• Example: Quick sort - [3, 6, 8, 10, 1, 2, 1]...read more
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Q2. What is Binary Serch Tree and its Time Complexity.
Ans. 
Binary Search Tree is a data structure where each node has at most two children, with left child smaller and right child larger. Time complexity is O(log n) for search, insert, and delete operations.
• Nodes have at most two children - left child is smaller, right child is larger

• Search, insert, and delete operations have time complexity of O(log n)

• Example: In a BST, if we search for a value, we can eliminate half of the r...read more
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Q3. Java code on HashMap().
Ans. 
HashMap is a data structure in Java that stores key-value pairs.
• HashMap is part of the Java Collections framework.

• Keys in a HashMap must be unique.

• Values in a HashMap can be duplicated.

• Example: HashMap<String, Integer> map = new HashMap<>();

• Example: map.put("John", 25);
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Q4. Write down the linked list implementation code .
Ans. 
Implementation of a linked list in code format
• Define a Node class with data and next pointer

• Create LinkedList class with methods like insert, delete, search

• Handle edge cases like empty list, inserting at beginning/end
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Q5. Difference between interface and abstract class
Ans. 
Interface defines only method signatures while abstract class can have method implementations.
• Interface cannot have method implementations, only method signatures

• Abstract class can have method implementations along with abstract methods

• A class can implement multiple interfaces but can only inherit from one abstract class

• Interfaces are used to achieve multiple inheritance in Java

• Abstract classes can have constructors wh...read more
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Q6. Difference between array and linked list ? Arraylist and LinkedList in collection framework
Ans. 
Array is a fixed-size data structure while linked list is a dynamic data structure. ArrayList and LinkedList are implementations of List interface in Java.
• Array is a contiguous block of memory with fixed size, while linked list is a collection of nodes where each node points to the next node.

• ArrayList in Java is implemented using an array, which can dynamically resize itself. LinkedList is implemented using nodes with ...read more
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Q7. What is polymorphism
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: a superclass Animal with subclasses Dog and Cat. Both Dog and Cat can be treated as Animals.
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